19781000

素因数分解:

$2^3\times 5^3\times {\mathrm{131}}^1\times {\mathrm{151}}^1$

素因数の和:303

約数の個数: 64

約数和(自身を含む): 46949760

約数和(自身を除く): 27168760

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 131, 151, 200, 250, 262, 302, 500, 524, 604, 655, 755, 1000, 1048, 1208, 1310, 1510, 2620, 3020, 3275, 3775, 5240, 6040, 6550, 7550, 13100, 15100, 16375, 18875, 19781, 26200, 30200, 32750, 37750, 39562, 65500, 75500, 79124, 98905, 131000, 151000, 158248, 197810, 395620, 494525, 791240, 989050, 1978100, 2472625, 3956200, 4945250, 9890500, 19781000]

約数ペア:

[(1, 19781000), (2, 9890500), (4, 4945250), (5, 3956200), (8, 2472625), (10, 1978100), (20, 989050), (25, 791240), (40, 494525), (50, 395620), (100, 197810), (125, 158248), (131, 151000), (151, 131000), (200, 98905), (250, 79124), (262, 75500), (302, 65500), (500, 39562), (524, 37750), (604, 32750), (655, 30200), (755, 26200), (1000, 19781), (1048, 18875), (1208, 16375), (1310, 15100), (1510, 13100), (2620, 7550), (3020, 6550), (3275, 6040), (3775, 5240)]